18466821 has 12 divisors (see below), whose sum is σ = 26759200. Its totient is φ = 12272040.

The previous prime is 18466801. The next prime is 18466829. The reversal of 18466821 is 12866481.

It is not a de Polignac number, because 18466821 - 2⁶ = 18466757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18466829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121 + ... + 6078.

Almost surely, 2^18466821 is an apocalyptic number.

It is an amenable number.

18466821 is a deficient number, since it is larger than the sum of its proper divisors (8292379).

18466821 is a wasteful number, since it uses less digits than its factorization.

18466821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6536 (or 6533 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18466821 is about 4297.3039222284. The cubic root of 18466821 is about 264.3204184557.

The spelling of 18466821 in words is "eighteen million, four hundred sixty-six thousand, eight hundred twenty-one".